Test 2 : the weight of the precipitate obtained with cadmium chloride should
not be less than 0-025 gram.
Test 3 : ammonia absent.
Test 4 : at least 50 c.c. should distil below 140° and not less than 90 c.c.
below 160° (including the preceding amount).
Test 5 : should mix completely with water and give a clear or barely opales-
Test 6 : the layer of pyridine bases separating should occupy at least 18-5 c.c.
Test 7 : not less than 9-5 c.c. N-sulphuric acid should be used.